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Structure of the eye
In an eye suffering from age-related macular degeneration or retinitis pigmentosa, the photoreceptors of the retina die and eyesight is lost. A company called Optobionics is working on a chip that would be placed behind the retina, stimulating dying photoreceptors to continue translating light into neural signals.
The Optobionics Artificial Silicon Retina chip, here seen on a penny, is just a few millimeters in diameter and thinner than a human hair. The chip's surface is covered with microscopic solar cells that gather energy from light entering the eye.